This monograph presents recent existence results of nonlinear oscillations of Hamiltonian PDEs, particularly of periodic solutions for completely resonant nonlinear wave equations. The text serves as an introduction to research in this rapidly growing field.

Many partial differential equations (PDEs) that arise in physics can be viewed as infinite-dimensional Hamiltonian systems. This monograph presents recent existence results of nonlinear oscillations of Hamiltonian PDEs, particularly of periodic solutions for completely resonant nonlinear wave equations.

After introducing the reader to classical finite-dimensional dynamical system theory, including the WeinsteinMoser and FadellRabinowitz bifurcation results, the author develops the analogous theory for nonlinear wave equations. The theory and applications of the NashMoser theorem to a class of nonlinear wave equations is also discussed together with other basic notions of Hamiltonian PDEs and number theory. The main examples of Hamiltonian PDEs presented include: the nonlinear wave equation, the nonlinear Schrödinger equation, beam equations, and the Euler equations of hydrodynamics.

This text serves as an introduction to research in this fascinating and rapidly growing field. Graduate students and researchers interested in variational techniques and nonlinear analysis applied to Hamiltonian PDEs will find inspiration in the book.

Introductory treatise to the current research in the field Includes an appendix that discusses the basic noties of Hamiltonian PDEs and number theory

Inhalt
Finite Dimension.- Infinite Dimension.- A Tutorial in NashMoser Theory.- Application to the Nonlinear Wave Equation.- Forced Vibrations.